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Subject (Era)
- Cretaceous14
- Precambrian8
- Paleozoic7
- Tertiary7
- From 65 to 140 million years ago6
- Quaternary6
- Mesozoic5
- Cenozoic4
- Mississippian4
- Pennsylvanian4
- From 230 to 570 million years ago2
- Jurassic2
- Permian2
- 19921
- Devonian1
- Eocene1
- From 10 thousand to 2 million years ago1
- From 140 to 190 million years ago1
- From 190 to 230 million years ago1
- From 2 million years ago1